A flow meter is a device used to measure flow rate volumetric or mass or the quantity of fluids passing through a pipe. Principles and methods of temperature measurement course content temperature can be measured via a diverse array of sensors. There are several types of flow measurement devices currently in use across. Associate professor, mechanical and materials engineering department portland state university. In a differential pressure drop device the flow is calculated by measuring the pressure drop over an obstructions inserted in the. Flow measuring technology for liquids, gases and steam products and services at a glance. There are many different types of temperature measurement devices, each one tailored to meet a specific need. Several factors determine the pressure drop that occurs in fluid flow applications including laminar versus turbulent flow, the flow velocity, kinematic viscosity and reynolds number of. In industrial work settings, the accurate measure of flow is highly critical. Bennett abstract three techniques of boreholeflow measurement are particularly suitable for use. Design details of a practical flowmeter installation. These protocols have been beneficial in drawing attention to the potential inaccuracy of blood pressure measuring systems, they permit comparison between devices and they have brought. Pdf fluid flow measurement techniques researchgate.
Head loss through parshall flumes is lower than for other types of openchannel flow measuring devices. Flow measuring technology for liquids, gases and steam. Pressure drop in piping, measuring device small appreciable. Industrial flow measurements include measuring of flow rate of solids, liquids and gases.
Numerous practical details provide the user with valuable information about flow metering in industrial applications. Classification of flow measurement techniques types of. There are any number of flow measurement devices for closed systems, based on differential head over an obstruction, moving fluid physical effects, or positive displacement. Flow explain how devices generate a differential pressure signal. Not only does this define profit or loss, but consumer and worker. Total flow meters, usually volume totalizers, are devices filled with a defined volume which is then. The major advantages of orifice plate are that it is low cost device, simple in construction and. Also termed as inferential type of flow measuring devices. Obstructiontype flow meters me 322 lecture slides, winter 2007 gerald recktenwald. Different types of flow measuring devices slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. All of them infer temperature by sensing some change in a physical.
Mechanical flow measurement devices enggcyclopedia. There are different classification of flow measurement techniques for measuring the flow rate and total flow. Information concerning the volume of available water is very helpful in planning for its future use and distribution. An orifice flow meter is the most common head type flow measuring device. Methods of flow measurement in well bores by eugene p. Flumes are openchannel flow segments built with contracted sidewalls andor raised bottoms. Different technologies types of flow meters proteus. Differential pressure flow instruments create a differential pressure in a fluid flowing through a pipe which can be measured. Flow measurement device article about flow measurement. A venturimeter is a device meant for measuring the quantity of a liquid flowing through a pipe.
Flow meters can do this linearly, nonlinearly, volumetrically, or on a weight. Fluid flow devices fall into a number of device categories as well as fluid classes. There are other types of open channel devices, including magnetic, velocity head, and dilution types. In some flow meter the flow is measured as the amount of fluid passing through the. Flow measuring device an overview sciencedirect topics. Among the various types of flumes available as flow measuring devices summarized by us bureau of. Flow measurement device in physiology, an instrument used for measuring the volume rate of blood flow in a blood vessel flowmeter or for measuring expired air flow pneumotachometer.
Flume walls are vertical and the floor of the throat is inclined downward. Selection and maintenance of temperature measurement. In general we can split the fluids into two classes. Industrial flow measurement industrial flow measurement. Understand the basic principle of operation of an obstruction type flowmeter. Different types of flow elements or flow sensors are pitot tube, annubar flow element, orifice, venturi, flow nozzle and differential pressure flow sensors. A flow meter is a piece of equipment used to measure the flow rate of solids, liquids, or gases. Flow meter is an instrument used for the measurement of the amount of liquid, gas or vapor that passes through them. Instrumentation is the art of measuring the value of some plant parameter, pressure. Advantages and disadvantages of different types of fluid. Accurate flow measurement is very important for proper and equitable distribution of water among water users. Flow measurement the continuous velocity and temperature measurement is very important when operating a system with gas flows for example indoor exhaust air, exhaust gases.
Flow measurement methods other than positivedisplacement flowmeters rely on forces produced by the flowing stream as it overcomes a known constriction, to indirectly calculate flow. These sensors are generally part of a flow meter that would help to measure the flow rate. The most common method used by the usgs for measuring velocity is with a current meter. Flow measuring devices can be primarily classified based on the type of flow measurement either mass flow measurement or volumetric flow measurement. Pressure drop devices based on bernoulli principle a venturi b orifice plate c pitot tube 2. Differential devices with a flow measurement mechanism. This fact sheet provides information on the types, use, and calibration of temperature measuring. Our product finder helps you to search for suitable measuring devices, software or system components via product characteristics. However, a variety of advanced equipment can also be used to sense stage and measure. The basic operating principle of differential pressure flowmeter is. There are different classification of flow measurement. Clean or dirty wet or dry hazardouscorrosive or safe single or multi phase laminar of turbulent varying. In its simplest form, the device consists of a short converging section leading to a throat and followed by a diverging section. A common method of measuring flow through an open channel is to measure the height of the liquid as it passes over an obstruction as a flume or weir in the channel.
Flow sensors are devices which are used to measure a flow rate of fluid. Four different types of flow meters has been present above with their advantages and disadvantages and according to those venture meter is the best choice for the flow meter as it has. The major advantages of orifice plate are that it is low cost device, simple in. Different types of temperature measuring devices june 30, 2018 june 30, 2018 admin 0 comments thermal engineering.
749 1440 1424 229 478 801 999 965 605 981 73 1156 417 415 843 487 526 302 1267 1559 75 1196 670 581 894 1550 56 471 760 468 835 802 125 1209 1114 454 38